Go on Amazon and check out clean waste portable toilet. Packs up small and the Wag bags are nicer to deal with than the liquid chemicals used in traditional portable toilets. No mess and no stink. I face mine forward for use, but sit facing aft. It is more stable this way. I also buy the wag bag military version in 50 count packages which gets the cost down to about $2. I prefer this in a secluded anchorage to a public restroom at the city dock or park. Cleaner, smells better and it offers a great view. The sealed bags can be legally disposed of in any onshore trash receptical. Sent from AOL Mobile Mail On Monday, July 2, 2018 doug <montgomery_boats@mailman.xmission.com> wrote: Hey, what do you use for a porta potty in your M-15. The space for one is so so small that I cannot find a single porta potty that would fit in that 12” wide space.